यदि \(a_2=20\) और \(a_4=80\) है, तथा (r) धनात्मक है, तो \(a_6\) क्या होगा?
If \(a_2=20\) and \(a_4=80\), and (r) is positive, what will be \(a_6\)?
Explanation opens after your attempt
C. (320)
Concept
\(a_4=a_2r^2\), so \(r^2=4\), and \(a_6=a_4r^2=80\cdot4=320\). The same multiplier applies over the same gap.
Why this answer is correct
The correct answer is C. (320). \(a_4=a_2r^2\), so \(r^2=4\), and \(a_6=a_4r^2=80\cdot4=320\). The same multiplier applies over the same gap.
Exam Tip
\(a_4=a_2r^2\), इसलिए \(r^2=4\), और \(a_6=a_4r^2=80\cdot4=320\)। समान दूरी पर वही गुणक लगता है।
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